To find the difference between the temperature and the wind chill, you subtract the wind chill from the temperature:
Temperature: -6°F
Wind Chill: -12°F
Difference = Temperature - Wind Chill
Difference = -6°F - (-12°F)
Difference = -6°F + 12°F
Difference = 6°F
So, the correct answer is A. 6°F.